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Mixing in singleton methods

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Daniel Berger

Posts: 1383
Nickname: djberg96
Registered: Sep, 2004

Daniel Berger is a Ruby Programmer who also dabbles in C and Perl

Mixing in singleton methods

Posted: Jul 21, 2009 5:48 AM

This post originated from an RSS feed registered with Ruby Buzz by Daniel Berger.
Original Post: Mixing in singleton methods Feed Title: Testing 1,2,3... Feed URL: http://djberg96.livejournal.com/data/rss Feed Description: A blog on Ruby and other stuff.	Latest Ruby Buzz Posts Latest Ruby Buzz Posts by Daniel Berger Latest Posts From Testing 1,2,3...

I released facade 1.0.3 today. I don't know if I've blogged about it before so I thought I would mention it. In short, it lets you mix in (all or some) singleton methods from a class or module, and turn them into instance methods of the extending class without overriding any existing methods.

For example, there are several singleton methods of the File class, such as File.basename, File.dirname, etc. What if you want to mix them into the String class directly as instance methods? Here's how you do it:

require 'facade'

class String
   extend Facade
   facade File, :dirname, :basename
end

str = '/export/home/djberge'
str.basename # => 'djberge'
str.dirname  # => '/export/home'

Neat, eh?

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